Automatic reversible driving-chuck



B. PI TAIIBUTTON` AUTOMATIC REVERSIBLE DRIVING CHUCK.

APPLICATION FILED IIIAILZQ, IQIQ. 1,341,085. Patentd Mw 25, 1920.

2 SHEETS-SHEET l.

R. Px TARBUTTUN. AUTOMATIC REVERSIBLE DRIVING CHUCK.

APPLICATION FILED III/III.29, I9I9. 'Pbtlled M357 25, 19mg 2 SHEETSv--SHEET 2.

UNITED STATES RALPH P. TARBUTTON, OF LIMA, OHIO.

AUTOMATIC REVERSIBLE DRIVING-CHUCK.

Application filed March 29, 1919.

To all Iwhom t may concern:

lle :it known that I, RALPH l?. TAnnU'r'roN, a citizen of the United States, residing at Lima, in the county of .Allen and State of Ohio, have invented certain new and useful Improvements in Automatic Reversible l')riv.ingChucks, of which the following is a specification, reference being had therein to the accompanying drawings.

rThis invention. relates to an automatic reif'ersible driving chuck, and has for its ob ject the construction of a chuck that is provided with simple and eiiicient means for allowing the reversing of the chuck to release the tool or member engaged by the jaws, or to allow the jaws to gri a member or tool for operating the too gripped in a different direction from that direction in which the tool may formerly have been driven.

lVith this and other objects in view, my invention comprises certain novel constructions, combinations, and arrangements of parts as will be hereinafter specifically de scribed, illustrated in the accompanying drawings, and more jnlrtirularly pointed out in the appended claim.

l'n the drawings,

Figure 1 is a view in elevation and partly in section of a chuck constructed :in accordance with the present invention, while Fig. E2 is a secton taken on lineQ-J), Fig. 1, looking in the direction of the arrows.

Fig. 3 is a view in elevation of a chuck constructed in accordance with the present invention. j

Fig. 4; is a sectional view taken on line 4-ef1, Fig. 1, looking in the direction of the arrows.

Fig. 5 is a perspective view of the locking ring.

Fig. 6 is a rear view of the gripping collar.

Fig. 7 is a side view of the jaw guide or holder, showing the gripping collar assembled therewith.

Fig. 8 is a fragmentary view of the head of the chuck.

Referring to the drawings by numerals, 1 designates the shank and 2 the head of the chuck. The head is reduced at 3 (Fig. 8) producing an annular shoulder 4, upon which is rotatably mounted the locking ring 5 which is roughened or knurled upon its outer face for facilitating the gripping thereof; this collar 5 is provided with a Specification of Letters Patent.

.Patented May 25, 1920.

Serial No. 286,058.

transversely-construeted V-shaped notch G, for the purpose hereinafter described.

The head 2 is provided with a socket having side walls 7, T bored eccentrically, and between walls 7, 7 are bearing surfaces 8, 8 arranged directly opposite each other; these surfaces S are cam-like in their function for forcing the sliding jaws 9 farther into the jaw holder 10.

The jaw holder 10 is hollow, and is provided at opposite sides with jaw-receiving slots 11; each slot 11 is provided with an inwardly beveled end 12 (Figs. 1 and 7). Fach jaw 9 is provided with similarly-constructed ends, producing jaws of substantially wedge-shape, whereby the jaws will not be permitted to drop entirely into the aw holder 1l), but the jaws 9 can move outwardly upon the holder as shown in dotted lines (Fig. il() for releasing the tool or object formerly held between the jaws.

Fach jaw is beveled at 13 at its outer corner so that any tool or object to be gripped of a round structure can be readily forred between the jaws. rlhe jaws have longitudinally-extending teeth 14: formed tl'iereomwhich teeth will enable the jaws to tightly grip an object placed therebetween for causing the object to rotate forwardly or baclnvardly, so to speak, after the jaws have been moved to the position shown in Figs. 1 and ft. .lf transverse teeth are formed upon the jaws, or teeth at right angles to the position of teeth 141, then the jaws can be used for gripping an object to he pulled, when it is desired to use the chuck as a pulling tool; there is no invention in arranging the teeth 14; longitudinally of the jaws, or in arranging the teeth transversely of the jaws, but the arrangement of the jaws longitudinally permits the jaws to grip an object to be rotated, and the arrangement of the teeth transversely permits the jaws to grip an object to be pulled.

A gripping collar 15 is placed against the inner end of the jaw holder 10, and by means of pins 1G extending through apertures 17 of the collar, and also extending into suitable sockets formed in the holder 10, this collar can be secured upon the inner end of the holder 1() against independent rotary movement; the collar 15 is provided with a gripping surface or teeth 18 for holding the inner end of an object or tool that has been run into the chuck, while the head 2 and shank 1 of the chuck are slightly rotated.

In the outer face of the holder l0 is formed an elongated slot 19, which slot extends around the holder a suitable distance and isprovided for receiving alternately the inner ends of pins 20. Each pin 2O is slidably mounted in an enlarged aperture 21 formed inthe reduced portion of the head 2, upon which reduced portion is rotatable ring 5. The inner end of each aperture is reduced in size to substantially the size of the pin 20; the pin 20 has a tapering or wedge-like outer head 22 that rides into the V-shaped notch 6 ofa'ing 5. Around each pin 20 is positioned a coil spring 23 which exerts an outward pressure or pull upon the pin for holding the same in the notch 6, causing the inner end of the pin to be moved from engagement with the jaw holder 10, but when the ring 5 is moved so as to force the head 22 of a particular pin downwardly, then the inner end of the pin is forced into the elongated socket or slot 19, causing the jaw holder to be limited in its rotary movement, locking the aw holder in one direction against further movement at the desired position, and at the same time the jaws 9, by reason of the cam-like bearings 8, are forced downwardly to their limit into the holder l0 for gripping an object securely that may be between the jaws. If it is desired to grip and rotate an object held by the jaws 9 in the opposite direction to that position shown in Fig. 4, all that is necessary is to rotate sleeve 5 so that the socket 6 will move over the left-hand pin 2() (Fig. 4), allowing the head of this pin to ride up into the notch 6, thereby al lowing the holder l0 to be rotated for causing the jaws 9 to move to the dotted positions in the chuck head, allowing the jaws to slide out sufficiently to release the tool or object gripped. This turning of the holder 10 so as to position the jaws 9, as shown in dotted lines in Fig. 4, is caused by turning` the tool backward which is held between the jaws. AAfter the jaws are in the position shown in dotted lines, Fig. 4, the tool can be inserted between the jaws, then the chuck f turned so as to pla-ce the outer ends of the jaws directly against the bearings S, forcing the jaws against the object to be worked upon and at the same time one of the pins will be extending at its inner end into the groove or socket 19, locking the chuck head and the jaw holder against further independent rotary movement, so that, in the desired direction, the j awV holder and the chuck head and the shank will rotate together.

A cap ring 24 is placed over the outer end of head 2 and the outer end of jaw holder l0 (Figs. l, 2, and 3), and this cap ring is held in position by suitable fastening means as screws 25 (dotted lines). The central bore or openine` 26 of cap ring 25 is slightly larger in diameter than the opening in the jaw holder so as to afford a ready entrance of the toolvor object to be worked upon when entering the jaw holder l0, between the jaws 9.

In the accompanying drawings and in the foregoing description, I have preferably illustrated and described the preferred form of my invention, but certain minor changes or alterations may appeal to one skilled in the art to which this invention relates, in manufacturing my chuck, and, therefore, I reserve the right to make such minor alterations and changes as shall fairly fall within the scope of the appended claim.

Vhat I claim is:

In a device of the class described, the co1nbination of a head provided with a central hollow body having eccentric faces and with oppositely-positioned bea-rings constituting cam surfaces, a holder in said head and provided with slidable jaws, said jaws adapted to engage at their outer ends said cam bearings for forcing the jaws to their furthermost inner position, and spring-pressed pins carried by the head and alternately engaging the holder for fastening the holder against independent rotary movement with respect to the head in different directions.

In testimony whereof I hereunto aliix my signature.

RALPH P. TARBUTTON. 

